When Chase changed the Chase travel portal to use Expedia as the back end users lost the ability to book low cost carriers such as Southwest. It’s now possible to book Southwest flights again via phone (same as before). Chase UR points are worth 1.25¢ if you have the Chase Sapphire Preferred or 1.5¢ per point if you have the Chase Sapphire Reserve. Keep in mind you can also transfer points to Southwest at a rate of 1:1, Southwest points are worth 1.28¢ per point but you don’t pay taxes on award flights so the value can be significantly higher. Keep in mind if you do book through the Chase travel portal you’ll earn Southwest points back on the flight itself.
Hat tip to HealthyGrain via VFTW